Tap-wrench.



Patented mar. 2e, mor. w. e. HonsFlELn.

TAP WRENCH n Med Nov. 1,

WILLIAM E. I'IORSFIELD, OF MANSFIELD, MASSACHUSETTS, ASSIGNOR TO S. lV.CARD MANUFACTURING COMPANY, OF SAME PLACE.

TAP-WRENCH.

SPECIFICATION forming` part of Letters Patent No. 670,899, dated March26, 1901. Application led November 1, 1900- Serial No. 35,084. (Nomodel.)

To @ZZ whom, it may concern:

Beit known that I, WILLIAM E. HoRsFIELD, a citizen of the United States,residing at Mansfield, in the county of Bristol and State ofMassachusetts, have invented an Improvement in rI`ap-VVrenches, of whichthe following description, in connection with the accompanying drawings,is a specification, like numerals on the drawings representing likeparts.

My invention relates to what are known as tapwrenches, the samecomprising a suitable stock having oppositely-disposed han* dlesattached thereto, one of the handles being rigid therewith and the otherhaving a turning connection with the stock, the said stock supportingthe usual fixed and movable jaws between which the shanks of a tap orreamer may be clamped, the movable jaw being operated by a thrust-pinwhich has a sliding connection with the stock and projects beyond thesame to engage a screw-threaded socket in the turning-handle, wherebythe turning of the handle operates to open and close the jaws of thewrench. The handle also has a screw-threaded engagement with the stock,the screw-threads on the stock being opposite to those on thethrust-pin, with the result that the longitudinal movement given to themovable jaw from a certain turning motion of the handle islargelyincreased In the drawings, which show the best form of theinvention now known to me, Figure 1 illustrates a plan View of thewrench with a portion of the handle broken away; and Fig. 2 is a centralsection on the line @c Fig. 1.

The stock is represented by 3, it having the usual rectangular opening11 in the central portion thereof and the usual Xed and movable jaws 5and 6, supported in said opening, the fixed jaw 5 being locked in placein any usual way, as by a screw 7, and the movable jaw having a slidingmotion longitudinal of the opening 5, as usual in this class of devices.

The stock 3 has projecting from it in opposite directions the handles 89, the handle 8 being preferably rigid with the stock, while the handle9 is mounted for turning move- `5o ment thereon, and suitable means areprovided whereby this turning movement of Vthe handle 9 may betranslated into a longitudinal motion of the movable jaw 6. The stock 3has the neck l0, which is centrally bored to receive for slidingmovement the thrust-pin 1l, the said thrust-pin being rigidly connectedto the movable jaw 6 in any suitable way, as by the pin 17, the saidthrustpin extending some distance beyond the outer end of the neck 10,such extended end being screw threaded and engaging a screwthreadedsocket 12 in the handle 9. The iuner end ofthe handle is counterbored,forming the enlarged socket 13, concentric with the socket 12, the saidenlarged socket being sleeved over the neck 10 as illustrated. Vith thisconstruction it will be obvious that by turning the handle 9 thethrust-pin 11 will be moved longitudinally, thus opening or closing thejaws 5 and 6, and in order to increase this longitudinal movement for acertain turning motion of the handle 9 l provide the neck 10 withexterior screw-threads opposite to those on the thrust-pin 1l andprovide the socket 13 with interior screw-threads coperating with thoseon the neck 10, the screwthreads on the neck 10 being in this instanceshown as right-hand screw-threads and those on the thrust-pin beingshown as lefthand screw-threads. With this construction by turning thehandle 9 it is given a longitudinal motion with reference to the stock10 and at the same time the thrust-pin and movable jaw is given alongitudinal motion -with reference tothe handle and in the same direcltion as that of the handle, the result being that the total longitudinalmotion given to the movable jaw is the sum of the longitudinal movementof the handle on the stock and of the thrust-pin with reference to thehandle.

The extreme inner end of the socket 13 may be smooth, if desired, as at14, this smooth portion acting as a protector to the threads on the neck10 when the handle is turned to open the jaws.

From the above description it will be seen that my tap-wrench isconstructed of few parts, the construction being such that all of thescrew-threaded parts are protected and cannot, therefore, get out oforder.

If desired, the handle 9 may be provided with the milled portion 15 inorder to better grasp the same.

, Having described my invention, what I claim as new, and desire tosecure by Letters Patent, is*

l. As an article of manufacture, a 'rapwrench comprising a stock havingan exteriorlvscre Mthreaded neck provided with a cen tral bore, fixedand movable jaws in said stock, a thrustpin rigidly conneeted'to themovable jaw and slidingly sustained in said bore, said Thrust-pin"projecting beyond the end of the stock and having' screw-threads on itsprojecting end opposite to those on the neck ofthe stock, and a handle*having concentric, interiorly-screW-threaded sockets engaging the neckand thrust-pin respectively, whereby when the handle is rotated themovable jaw is operated.

' 2. A tap-Wrench eomprisinga stock having an eXteriorly-threaded neck,provided with a tric with but smaller than the screw-threaded socketwhich engages the neck of the stock. In testimony whereof I have signedmy name to this specification in the presence of two subscribingwitnesses.

WILLIAM E. HORSFIELD. Witnesses:

ALMA M. HAGERTY, MARION H. BARRETT.

